The containment vessel of reactor No. 3 at the Fukushima Daiichi nuclear power plant may be ruptured after three workers within the plant stepped into water that contained "10,000 times the amount" of radiation that is normal for that area

Now, CNN.com has reported that the containment vessel of reactor No. 3 at the Fukushima Daiichi nuclear power plant may be ruptured after three workers within the plant stepped into water that contained 10,000 times the amount of radiation that is normal for that area. The job of the containment vessel is to keep radioactive material from entering the atmosphere, and according to Hidehiko Nishiyama from the Japan nuclear and industrial safety agency, "contaminated water likely seeped through the containment vessel protecting from the reactor's core."

The three workers, which were laying cables in the basement of the No. 3 reactor, were escorted to Japan's National Institute of Radiological Sciences after stepping in the radioactive water. According to Japan's Health Ministry, a person living in an industrialized country is exposed to 3 millisieverts of radiation annually. For those working directly with the nuclear plant during the current situation, the maximum level of exposure is 100 to 250 millisieverts per year. The three men who stepped in the radioactive water was a 30-year-old with an exposure level of 180.7 millisieverts, a 20-year-old with 179.37 millisieverts and a third man with no age specified that was exposed to 173 millisieverts of radiation. All three men spent 40 to 50 minutes in the 15-centimeter deep water.

While water in this area is normally boiled and has low levels of radiation, Nishiyama is concerned for the 536 other people working at the plant Friday when the incident occurred, and would like to improve radiation management measures.

Nishiyama would also like to improve radiation management measures at reactor's 1 and 2, which have been manageable as of late but are still experiencing difficulties. For instance, reactor No. 1 has had issues with increased pressure, and reactor No. 2 needs to switch the water for its spent fuel pool from saltwater to freshwater in order to prevent further corrosion from the salt.

Reactors 4, 5 and 6 are being watched as well, but do not pose as much of a threat since they underwent scheduled outages during the earthquake.

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